Matching Pairs Types of Barriers VocabularyOnline version Click on the box to match the correct term and definition. by Stephanie Muniz 1 levee 2 sand dune 3 sand bags 4 sea wall 5 dam a barrier that blocks flowing water or sends it in a new direction. a bank built along a river to prevent flooding bags filled with sand a wall built to protect land along the coast from erosion and flooding from the sea a hill of sand near an ocean or in a desert that is formed by the wind